<div dir="auto"><div>Hi August. <div dir="auto"><br></div><div dir="auto">If the main panel had a 400A rated bus and the sub was 200A then I think you could make a good argument but it appears the main is a 200A bus so therefore the sum of all load and supply breakers on that bus is 400A (loads plus solar excluding the main breaker), which does not comply with the Code language nor intent. The feed through lugs do not create a single bus, you now just have two buses and a feeder conductor to evaluate. Once the solar is connected you there are two sources feeding the main panel bus, not just the utility. You can exclude one but not both when evaluating the main panel bus.</div><div dir="auto"><br></div><div dir="auto">Hope I correctly assessed your situation.</div><div dir="auto"><br></div><div dir="auto">Jason Fisher </div><br><div class="gmail_extra"><br><div class="gmail_quote">On Apr 19, 2017 6:01 PM, "Mark Frye" <<a href="mailto:markf@berkeleysolar.com">markf@berkeleysolar.com</a>> wrote:<br type="attribution"><blockquote class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
True, but, the intent of the Code is not to always allow the
interconnection of the maximum amount of PV power possible, so long
as an over-current event cannot occur.<br>
<br>
Here we see Code that prevents over-current events in all cases. I
guess you could say that that is it's intent.<br>
<br>
Sadly, the case you show would not be one of those allowed.<br>
<br>
Happily, many that would not have been allowed in the past are now
allowed.<br>
<br>
This is called progress.<div class="elided-text"><br>
<br>
<div class="m_2606271941551758752moz-cite-prefix">On 4/19/2017 4:31 PM, August Goers
wrote:<br>
</div>
<blockquote type="cite">
<div class="m_2606271941551758752WordSection1">
<p class="MsoNormal"><span style="color:windowtext">Right, but
if we limit the load breakers to the bus rating per </span>NEC
705.12(B)(2)(3)(c), then there will never be an overcurrent
event.</p>
<p class="MsoNormal"><span style="color:windowtext"> </span></p>
<p class="MsoNormal"><span style="color:windowtext">August</span></p>
<div>
<div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="color:windowtext">From:</span></b><span style="color:windowtext"> RE-wrenches [mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@<wbr>lists.re-wrenches.org</a>]
<b>On Behalf Of </b>Mark Frye<br>
<b>Sent:</b> Wednesday, April 19, 2017 4:18 PM<br>
<b>To:</b> RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-<wbr>wrenches.org</a>><br>
<b>Subject:</b> Re: [RE-wrenches] NEC 705.12(B)(2)(3)(c)
intention</span></p>
</div>
</div>
<p class="MsoNormal"> </p>
<p>If your sketch shows that there are 200A of breakers in the
sub panel and 200A of breakers in the main, then, no, that
would not be the intent. The lug kit makes the two separate
bars into a single bar.<span style="font-size:12.0pt"></span></p>
<p>Mark</p>
<div>
<p class="MsoNormal">On 4/19/2017 3:29 PM, August Goers wrote:</p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal">Hi Wrenches –</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Now that we’re in the 2014 NEC, we’ve
increasingly been using the NEC 705.12(B)(2)(3)(c)
interconnection method:</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><img style="width:4.6458in;height:2.9687in" id="m_2606271941551758752Picture_x0020_1" src="cid:part3.3E24D755.2D54F2F1@berkeleysolar.com" alt="imap://markf@mail.lmi.net:143/fetch%3EUID%3E.Re-Wrenches%3E12200?header=quotebody&part=1.1.2&filename=image001.png" height="285" width="446"></p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">This is a great way of putting lots of PV
on a panel when there are few loads. As long as the total
breaker rating (excluding the supply breaker) equals the bus
rating or less, we’re good to go. However, we recently ran
into a panel that had a lug subfeed kit installed in it. </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Do you think the intention of the code is
to allow something like shown in this sketch?</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><img style="width:9.302in;height:5.25in" id="m_2606271941551758752Picture_x0020_2" src="cid:part4.60D56FC8.2B03FE1C@berkeleysolar.com" height="504" width="893"></p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Cheers,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">August</p>
<p class="MsoNormal">Luminalt</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><span><br>
<br>
<br>
</span></p>
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